The ammonoids from the Grès du Kahla supérieur of Timimoun (Middle-early Late Tournaisian; Gourara, Algeria)

Abstract

The ammonoids from two very prolific horizons in the upper Kahla Sandstone (Tournaisian, Early Carboniferous) of Timimoun (Gourara, Algeria) are described monographically. Nine new ammonoid species are introduced: <i>Imitoceras altilobatum</i> n. sp., <i>Triimitoceras amplisellatum</i> n. sp., <i>Kazakhstania inequalis</i> n. sp., <i>Acrocanites imperfectus</i> n. sp., <i>Xinjiangites scalaris</i> n. sp., and <i>Becanites canalifer</i> n. sp. from the North African <i>Kazakhstania-Acrocanites</i> Assemblage as well as <i>Acrocanites recurvus</i> n. sp., <i>Becanites singularis</i> n. sp., and <i>Becanites inflateralis</i> n. sp. from the <i>Pericyclus-Progoniatites</i> Assemblage. The first of these is one of the most diverse ammonoid faunas known from this time interval. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.200900009" target="_blank">10.1002/mmng.200900009</a>

The ammonoids from the Argiles de Teguentour of Oued Temertasset (early Late Tournaisian; Mouydir, Algeria)

“…The faunal lists show that the Calcaire de Vaulx has some resemblance with the lower assemblage described by Korn et al (2010a) from the Gr s de Kahla suprieur of Timimoun. The Calcaire de Calonne is, with its composition of genera, very similar to the assemblages from the Argiles de Teguentour at Oued Temertasset described herein.…”

“…Order Goniatitida Hyatt, 1884Suborder Tornoceratina Wedekind, 1914 Superfamily Prionocerataceae Hyatt, 1884 Family Prionoceratidae Hyatt, 1884 Subfamily Imitoceratinae Ruzhencev, 1950 Imitoceras Schindewolf, 1923 For a detailed discussion of the genus, see Korn et al (2010a).…”

“…The stratigraphic scheme for the North African occurrences of Early Carboniferous ammonoids proposed by Korn et al (2007) included two faunal bands (assemblages) within this genus zone, i.e. the Kazakhstania-Acrocanites Assemblage (known from the Gr s de Kahla suprieur near Timimoun; Korn et al 2010a) at the base and the Pericyclus-Progoniatites Assemblage (known from the Oued SnaÒgui Formation of Bouhamed in the Anti-Atlas; Korn et al 2003a) in the upper part. The fauna from Bouhamed contains genera also known from Oued Temertasset, except for Irinoceras and Orthocyclus, which are not known from the Mouydir.…”

The ammonoids from the Dalle àMerocanitesof Timimoun (Late Tournaisian-Early Viséan; Gourara, Algeria)

“…This fauna will be described here for the first time to compliment the monographs of the Early Tournaisian (Ebbighausen et al 2004), early Late Tournaisian (Korn et al 2010c(Korn et al , 2010a, as well as Early and Middle Vis an (Bockwinkel et al 2010) assemblages from the Central Sahara of Algeria.…”

Ammonoids from the Dalle des Iridet of the Mouydir and Ahnet (Central Sahara) and the Formation d'Hassi Sguilma of the Saoura Valley (Late Tournaisian-Early Viséan; Algeria)

“…Much more field work is necessary to uncover the rich assemblages of the two formations. However, the available material will be described here for the first time to compliment the monographs of the early Late Tournaisian (Korn et al 2010a(Korn et al , 2010b as well as the Early and Middle Vis an ) assemblages from Algeria.…”